They have just increased their tariffs by 34%! They cause continuous blackouts, and their biggest stroke of genius yet has been the "load shedding" system in which they switched off the power to some areas on purpose (and never kept to their own load shedding schedule anyway) and eventually led to one substation in Kempton Park blowing up because it was never designed to be switched on and off repeatedly.
They have no clue as to how their own infrastructure works, because they have fired all of their experienced white engineers to replace them with inexperienced affirmative action employees who would take years to learn how to do the job properly even if Eskom management could be bothered to train them.
Thanks to their bungling, the few power stations that do actually work properly can't be run at full capacity because the national grid is in such a shocking state of disrepair. Koeberg nuclear power station is never running more than tree of it's four reactors at any one time and almost all of their profit goes into Mercs, BMWs and 400% bonuses for their managers rather than new infrastructure.